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Welcome to the science podcast for December 4, 2015.

I'm Suzanne Bard.

In this week's show, we have David Grimm up first with some online news stories,

and then we hear from Paul O'T about what happens to our gut microbiota as we age.

Support for the science podcast is provided by AAAS, the American Association for the Advancement

of Science, advancing science, engineering, and innovation

throughout the world for the benefit of all people.

AAAS, the Science Society.

Now we have David Grimm, editor for our daily news site.

He's here to talk about some recent online stories.

I'm Sarah Crespi.

First up, we have a story on the long lives

of grandmothers. The grandmother hypothesis is an attempt to explain why women, past reproductive

age, continue to live. It sounds harsh, but in simple evolutionary terms, once you're done reproducing,

you cease to matter. Up to now,

the grandmother hypothesis has been based on the idea that caring for your children's children,

...